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首页> 外文期刊>International journal of applied mechanics and engineering >COMBINED EFFECT OF TEMPERATURE AND GRAVITY MODULATIONS ON THE ONSET OF CONVECTION IN AN ANISOTROPIC POROUS MEDIUM
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COMBINED EFFECT OF TEMPERATURE AND GRAVITY MODULATIONS ON THE ONSET OF CONVECTION IN AN ANISOTROPIC POROUS MEDIUM

机译：温度和重力调制对各向异性多孔介质中对流发生的综合影响

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摘要

The combined effect of time-periodic boundary temperature (TBT, also called temperature modulation) and time-periodic body force (TBF, also called gravity modulation) of small amplitude on convection in an anisotropic porous medium is investigated by making a linear stability analysis. A regular perturbation method is used to arrive at an expression for the correction Rayleigh number that throws light on the possibility of sub-critical motions. With respect to synchronous TBT and TBF for moderate frequency values, the role of the Prandtl number, horizontal porous parameter, mechanical and thermal anisotropy parameters and the Brinkman number in inducing sub-critical instability is delineated. An asymptotic analysis is also presented for small and large frequencies. A comparison is made between the effects of temperature, gravity and combined (temperature + gravity) modulations on convection. The problem illustrates a method of regulating convection.
机译：通过进行线性稳定性分析，研究了各向异性多孔介质中对流的时间边界温度（TBT，也称为温度调制）和时间周期体力（TBF，也称为重力调制）对流的综合影响。使用常规的摄动方法得出校正瑞利数的表达式，该表达式使人们了解了次临界运动的可能性。对于中等频率值的同步TBT和TBF，描述了Prandtl数，水平多孔参数，力学和热各向异性参数以及Brinkman数在诱发亚临界不稳定中的作用。还提出了针对小频率和大频率的渐近分析。比较了温度，重力和组合（温度+重力）调制对流的影响。该问题说明了一种调节对流的方法。

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